Results 81 to 90 of about 4,063 (161)

Moagem de pós de carbeto de silício em moinho planetário Planetary milling of silicon carbide powders

Cerâmica, 2005
Pó de alfa carbeto de silício (alfa-SiC) foi cominuído em moinho planetário durante os períodos de tempo de ½, 2, 4 e 6 h. A velocidade de rotação foi de 300 rpm, o meio de moagem foi álcool isopropílico e os corpos moedores foram esferas de ...
M. A. P. dos Santos, C. A. Costa
doaj   +1 more source

Tuning Ce‐Zr‐Al Mixed Oxide Supports to Enhance Pt‐Pd Catalyst Performance for Low‐Temperature CO and C3H6 Oxidation in Diesel Emissions

ChemCatChem, Volume 18, Issue 5, 13 March 2026.
ABSTRACT Diesel oxidation catalysts (DOCs) with low‐temperature activity are required for low‐temperature combustion diesel (LTC‐D) engine technologies to meet emission regulations. To probe the impact of oxygen availability on activity, bimetallic Pt‐Pd catalysts supported on Ce‐Zr‐Al mixed oxides with varying Ce/Zr/Al contents were systematically ...
Azam Movasati, Jay Nejad, Zhibin Ye, Melanie J. Hazlett   +3 more
wiley   +1 more source

Mixed valency in cerium oxide crystallographic phases: Determination of valence of the different cerium sites by the bond valence method [PDF]

, 2008
We have applied the bond valence method to cerium oxides to determine the oxidation states of the Ce ion at the various site symmetries of the crystals.
A. Trovarelli, A. Trzesowska, C. Ferraris, D. Taylor, E. Shoko, F. de Groot, F. Mohri, I. Brown, I. D. Brown, I. D. Brown, J. K. Burdett, J. Roehler, L. Eyring, M. F. Smith, M. Robin, P. Cox, P. Villars, R. D. Shannon, R. Hoppe, R. McWeeney, R. W. G. Wyckoff, Ross H. McKenzie, U. Mueller   +22 more
core   +2 more sources

Compositional and Fabrication Cycle Optimization of Ceria-Zirconia-Supported Mo-Based Catalysts for NH₃-SCR NO_x Reduction

Inorganics
The reduction of nitrogen oxides (NOx), critical pollutants from stationary to mobile sources, mainly relies on the selective catalytic reduction (NH3-SCR) method, employing ammonia to reduce NOx into nitrogen and water.
Luca Spiridigliozzi, Viviana Monfreda, Serena Esposito, Olimpia Tammaro, Nicola Blangetti, Fabio Alessandro Deorsola, Gianfranco Dell’Agli   +6 more
doaj   +1 more source

Propane Dehydrogenation Over Reduced CeO2 and CeZrO2

ChemCatChem, Volume 18, Issue 6, 27 March 2026.
Ceria, a non‐noble metal oxide considered inactive for propane dehydrogenation, is transformed into an active catalyst via a deep, bulk‐level reduction pre‐treatment that generates new active sites and unlocks alternative low‐energy pathways for this process.
Benjamín Bohigues, Laura Hernández, Aroa Alós, Francisco Gonell, Manuel Moliner, Mercedes Boronat, Pedro Serna   +6 more
wiley   +1 more source

2D and 3D photonic crystal materials for photocatalysis and electrochemical energy storage and conversion [PDF]

, 2018
This perspective reviews recent advances in inverse opal structures, how they have been developed, studied and applied as catalysts, catalyst support materials, as electrode materials for batteries, water splitting applications, solar-to-fuel conversion ...
Armstrong, Eileen, Collins, Gillian, Geaney, Hugh, McNulty, David, O'Dwyer, Colm, O'Hanlon, Sally   +5 more
core   +1 more source

Structural Determination, Oxygen Diffusion, and Storage Capacity of a High‐Entropy Fluorite‐Type Oxidation Catalyst

Small Structures, Volume 7, Issue 3, March 2026.
Inducing cationic high entropy on CeO2 modifies the structure, leading to increased oxygen diffusion and resistance to sintering. In turn, this leads to enhanced oxygen storage capacities without degradation, showing potential for oxidation catalysis.
Yuvraj Vaishnav, Mohamad Abou‐Daher, Cristina I.Q. Silva, Rohit K. Rai, Walid Al Maksoud, Marcell Toth, M. Viswanathan, Peng Ren, Fumitaka Takeiri, Shusaku Hayama, Samy Ould‐Chikh, Mohamed Nejib Hedhili, Maxim Avdeev, Wen Yin, Saburo Hosokawa, Genki Kobayashi, Isaac Abrahams, Aamir Farooq, Javier Ruiz‐Martinez, Yoji Kobayashi   +19 more
wiley   +1 more source

Universal In Situ Isotope Exchange Raman Spectroscopy (IERS) Methodology for Measuring Oxygen Surface Exchange Dynamics Using a Probe Layer

Advanced Functional Materials, Volume 36, Issue 17, 26 February 2026.
A bespoke multilayer thin film configuration has been designed, which overcomes the material dependency of conventional isotope exchange Raman spectroscopy (IERS). This universal IERS methodology is efficient, non‐destructive and provides additional structural information and time resolution, which can be further extended to various isotopic elements ...
Zonghao Shen, Francesco Chiabrera, Alexander Stangl, Laetitia Rapenne, Federico Baiutti, Carmen Jiménez, Albert Tarancón, Mónica Burriel   +7 more
wiley   +1 more source

Tetravalent doping of CeO2 : the impact of valence electron character on group IV dopant influence [PDF]

, 2013
Fluorite CeO2 doped with group IV elements is studied within the density functional theory (DFT) and DFT + U framework. Concentration-dependent formation energies are calculated for Ce(1-x)Z(x)O(2) (Z = C, Si, Ge, Sn, Pb, Ti, Zr, Hf) with 0
Bultinck, Patrick, Cottenier, Stefaan, Van Driessche, Isabel, Van Speybroeck, Veronique, Vanpoucke, Danny   +4 more
core   +3 more sources

Ceria Zirconia Mixed Oxides Prepared by Hydrothermal Templating Method for the Oxidation of Ethyl Benzene

Bulletin of Chemical Reaction Engineering & Catalysis, 2013
CeO2–ZrO2 oxides were prepared by the surfactant-templated method using cetyl trimethyl ammonium bromide (CTAB) as template. These were characterized by XRD, FT-IR, TEM, SEM, BET and TPD-CO2.
Cimi A Daniel, S. Sugunan
doaj   +1 more source